[Feature Request] Highlight text when is between <mark>...</mark>

[luispuerto]

it would be great if the text between the html tags <mark>...</mark> were highlighted somehow as it's highlighted when it's rendered to html.

It would facilitate reading and finding this tags, which sometimes are common when one uses markdown to take notes.

[luispuerto]

Thinking about it... I think it would be great if all the common basic html tags were highlighted somehow...